So I managed to exhaust the pages of my passport and did the LTR visa transfer to the new passport the other day. Emailed LTR Visa Unit to get the requirements and they send me as below- fairly painless except no special window for LTR holders so had the mandatory 3 hours queuing the window 14/15. Also the new stamps have already taken up 3 pages of the new passport!
Please note that no appointment is required to transfer your LTR Visa to a new passport. You may visit us during working hours, any time before 3:30 PM. To complete the visa transfer process, kindly follow these steps:
1. Please visit the Immigration One Stop Service Center for Visa and Work Permit (OSS). You don't need to appear in person; instead, you can authorize a representative or someone you know to bring your passports for the visa transfer. There is no additional fee for this service.
2. Bring the following documents:
- Original former and new passports
- Transfer stamp to new passport form, download here: https://bangkok.immigration.go.th/wp-content/uploads/2021/08/Transfer-Stamp-to-New-Passport-Form.pdf
- Certificate of visa transfer from your embassy (Your passport will require this document, when getting a new passport, please make sure to request for passport transfer certificate as well)
- Copies of former and new passports with your photo
- Copy of the last arrival stamp in your passport
- Copy of the LTR Visa stamp in your passport
- Copy of the last extended visa in your passport
- Copy of T.M. 6 Card (if applicable)
- Notification letter of qualification endorsement addressed to the Immigration Bureau (found within your LTR Visa account under the check status tab)
- 1-Year notification card (if applicable)
Please ensure that you transfer the visa before your current passport expires. If not, the LTR visa will become invalid and unusable.